Can someone explain how this differs from the non-pwm version? Is it just the number of wires? IF so why would one select that over the alternative?

PWM or pulse width modulation is one of several methods to control motor and hence in this case fan speed. The correct motherboard connection as noted below permits the fan speed to be modulated to increase cooling when computing loads are high and slowing the fan at other times. The only benefit being less fan noise.

Can this be mounted in place of a 50x50mm fan?

No, not unless you have room for it and can enlarge the mounting hole pattern and fan hole.

Can you convert this from 4 pin to 2 pin?

It comes with PWM to three pin adapters.... You'd have to hack up your own PWM to DC adapter

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Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

Product ID: 14165352

Details

Air Flow Capacity
29.2 cubic per
Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
3000 rpm

⏳150,000+ hours MTTF

🌀3000 RPM max speed

🔇Ultra-quiet 19.3 dB(A)

€ 40.71

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Silence Meets Performance: The Fan Your Setup Deserves

BUILT TO LAST - Engineered with fibre-glass reinforced PBT and backed by a 6-year warranty for unmatched durability.
COMPACT YET MIGHTY - 60x60x25 mm size fits tight spaces without compromising airflow of 29.2 m³/h.
WHISPER QUIET POWER - Experience premium cooling with noise levels as low as 19.3 dB(A), perfect for focused workspaces.
PRECISION PWM CONTROL - Seamlessly adjust fan speed from 550 to 3000 RPM for optimal airflow and energy efficiency.
PLUG PLAY VERSATILITY - Includes anti-vibration mounts, extension cables, and Y-splitter for effortless multi-fan setups.

The Noctua NF-A6x25 PWM is a premium 60mm quiet fan designed for professional-grade cooling with a max speed of 3000 RPM and ultra-low noise at 19.3 dB(A). Featuring advanced acoustic optimization and durable fibre-glass reinforced materials, it offers over 150,000 hours of reliable operation. Its 4-pin PWM control allows precise speed adjustments, making it ideal for DVRs, NAS, 3D printers, and compact desktop systems. Included accessories ensure easy installation and vibration-free performance.

Specifications

ASIN	B00VXTANZ4
Air Flow Capacity	29.2 cubic meter per hour
Best Sellers Rank	#104 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (2,698)
Global Trade Identification Number	00842431012524, 04716123315636
Item Dimensions L x W x H	2.36"L x 2.36"W x 0.98"H
Item Weight	41 g
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	3000 rpm
Model	NF-A6x25 PWM
Noise Level	19.3 db
Number of Items	1
Part Number	NF-A6x25 PWM
Power Connector Type	4-Pin
UPC	842431012524
Unit Count	1 Count
Voltage	12 volts
Warranty Description	6 year manufacturer’s warranty

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